2009 V6 - P0674 & Timing Chains

[mdistel]

Looking for some advice. I have owned our 2009 Cayenne since 2014, currently has 137k mi and for the first time its throwing a check engine light. My Durametric is pulling the following code and other posts about it have been inconclusive.

 

P0674:Fuel rail pressure sensor - inappropriately high - Upper limit value exceeded, test conditions are not-completed, fault is not currently active and causing a DTC light

 

I've monitored the car for a month and 1300 mi, the code comes/goes. Drivability is fine, only a slight hesitation off idle. Still has original PCV valve and likely brittle vacuum hoses. I have the parts ready to replace that and the valve cover.

 

I've read a bunch on the VR6 boards that the HPFP might be out of timing due to a loose chain (stretch or broken guides) and that is what is causing the error. I do not hear any chain rattle. I pulled the camshaft deviation values and they are -2/+1. A VW tech guide says replace if 8 degrees off but there is one video diagnostic showing a misaligned fuel pump, when they dug in the guide was broken.

 

Has anyone had and resolved this issue? Anyone go through pulling the engine to replace the timing chains? Can you instead drop the transmission, pull the intake and access the rear timing parts that way? Alternatively I could roll the dice and drive it until a real drivability issue crops up and evaluate cost/benefit then. We are purchasing a Certified 2016 Cayenne this weekend so the old one will only see about 3k mi/yr. 

 

 

[mdistel]

Looks like I only needed to do the PCV. After pulling the intake and replacing the PCV I have not experienced the code. My timing chain was tight and no evidence of broken guides.